I would do as many career fairs as I could in that situation with some interview prep beforehand. You are absolutely hireable but need to brush up on some networking to make it happen. Get your internals to drag you in front of a chief pilot even if it is just to critique the resume and explain the process. Any interaction could be the one that does the trick. Get your friends to reach out to anyone they know over here.

A lot of guys in your situation would bite the bullet and run through a regional to check the 121 box, recency of training box, and a little jet time. I don't think that is necessary but it would expedite things. It would suck from a quality of life / pay stance but I would guess that your phone would ring within 6 months. It might not be United straight away but it will probably be somewhere worth hanging your hat. Another option would be the LCC's and they would hire you in a heartbeat right now. I came from one and it was easier and a more professional training environment than most regionals. JetBlue hires a lot of piston guys from Cape Air, charter guys, and people that have been out of the industry awhile so they have experience shoe horning the 121 world into pilots seeing it for the first time. They would be light years ahead of any regional. Best of luck.